feat: Add AI credit topup flow for Stripe (#12988)

Co-authored-by: Shivam Mishra <scm.mymail@gmail.com>
Co-authored-by: Pranav <pranav@chatwoot.com>

config/routes.rb

@@ -24,6 +24,7 @@ Rails.application.routes.draw do
     get '/app/accounts/:account_id/settings/inboxes/new/:inbox_id/agents', to: 'dashboard#index', as: 'app_instagram_inbox_agents'
     get '/app/accounts/:account_id/settings/inboxes/:inbox_id', to: 'dashboard#index', as: 'app_instagram_inbox_settings'
     get '/app/accounts/:account_id/settings/inboxes/:inbox_id', to: 'dashboard#index', as: 'app_email_inbox_settings'
+    get '/app/accounts/:account_id/settings/billing', to: 'dashboard#index', as: 'app_account_billing_settings'
 
     resource :widget, only: [:show]
     namespace :survey do
@@ -438,6 +439,7 @@ Rails.application.routes.draw do
               post :subscription
               get :limits
               post :toggle_deletion
+              post :topup_checkout
             end
           end
         end